Caption: This Platytroctid is a Tube Shoulders. These fish expel a blue to green luminous fluid from a pore (the tubular papilla) which is located below the lateral line. The fluid is contained within something known as a shoulder sac apparatus, which is located under the shoulder girdle. The glowing fluid is hypothesized to be an escape mechanism, allowing these fishes to escape potential predators by distracting them with a brightly glowing cloud. Some species have light organs or photophores. This individual was trawled from between 1,500 and 1,200 meters depth, 2016. Image courtesy of the DEEPEND project.